Emerson MRLDS-250 - 1 Introduction; Overview; Detection Options; Broadband Vs. Gas Specific

Overview Introduction • 1
1 Introduction
1.1. Overview
The MRLDS-250 NDIR (non-dispersive infrared)
is a fixed gas detector that can detect a wide range of
refrigerant gases. The MRLDS-250 can be used on a
stand-alone basis or integrated into controls or a
Building Management System (BMS).
The MRLDS-250 can be used in locations that
require continuous monitoring and to add gas
detection solutions to an existing system.
Figure 1-1 MRLDS-250 Components
1.2. Detection Options
1.2.1. Broadband vs. Gas Specific
The MRLDS-250 NDIR refrigerant gas detectors
are available in two versions: broadband and
gas-specific.
1.2.2. Broadband Gas Detection
The broadband gas detector (P/N 809-0030) is
used as a general purpose gross leak detector and is
factory tested and certified. It is shipped from the
factory with ±35%
accuracy. If more accurate
detection is needed, gas-specific versions are
available (see Table 1-2), which are factory certified
and calibrated to the target refrigerant.
The broadband gas detector combines refrigerants
into three groups shown in Table 1-1. Measurement
performance is based on an average response profile
for all of the gases within the group.
1
See Section 5, Configure the Gas Detector for information on
Parameter 11 and other configuration instructions.
NOTE: Greater accuracy may be achieved
through the use of calibration gas and the
adjustment procedure detailed in Section 6,
Functional Tests and Adjustments.
Group #
Value for
Param 11
1
Refrigerant
1 P.-11 = 1
R123
R134a
R404a
R407a
R407c
R407f
R410a
R427a
R507
HFO1233ZD
R448A
R449A
2P.1-11 = 2
R422a
R422d
HFO1234YF
HFO1234Ze
R452A
R513A
3 P.-11 = 3 R22
4 P.-11 = 4 R32
Table 1-1 Broadband Gas Groups